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A radioactive, rare-earth element with an atomic number of 61. Prior to 1948, this element was called illinium. Promethium is a silvery-white metal that is recovered from spent uranium fission products. It is used in luminescent paint, x-ray sources and nuclear auxiliary power generators.

Synonyms and Related Terms

Pm; illinium


Strong radioactive poison.

Physical and Chemical Properties

Composition Pm (atomic no. 61)
Melting Point 1160 C
Density 7.2 g/ml
Molecular Weight atomic wt = 147

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